diff --git a/tests/cert.pem b/tests/cert.pem
new file mode 100644
index 0000000..8b1d471
--- /dev/null
+++ b/tests/cert.pem
@@ -0,0 +1,28 @@
+-----BEGIN CERTIFICATE-----
+MIIErjCCApYCCQDzWJgnuLzufzANBgkqhkiG9w0BAQsFADAZMRcwFQYDVQQDDA5s
+b2NhbGhvc3Q6ODA4ODAeFw0yMjA3MDIyMDQ5MzZaFw0yMzA3MDIyMDQ5MzZaMBkx
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+81teIY45pUN0AzoySxgjBr8Z/lKiEXhUq/OCZHEl6lOZGtExuwlwr8ZSZNqNFZkh
+iqNb8p81ER8nbk6U2T6tx7heBFb0hipfp5hywLL7DMffx1iqEdsIEqYJiFPT4oen
+34zM0vft/zMys8oqvo82sNSeQUwFfq0Tr5IopJSaGjud+x1qqRW8XEsyW5t5YEsk
+BjEcRgXWHsXOKRGuTdosftJyf6S/3MCysLrkwftOxWNi8Hin55XxzS6nmoGy0Y4y
+SOvyGjrlkzRdb187E5Exm2gqArTDJgvl0wFegRxqmQnAe0ABdLz/BYm9nt4AUQca
+ZeY=
+-----END CERTIFICATE-----
diff --git a/tests/debug.py b/tests/debug.py
new file mode 100644
index 0000000..5106dd7
--- /dev/null
+++ b/tests/debug.py
@@ -0,0 +1,54 @@
+import asyncio
+import ssl
+import socket
+import threading
+import time
+import pathlib
+
+import kloop
+
+
+def server():
+    ctx = ssl.SSLContext(ssl.PROTOCOL_TLS_SERVER)
+    cur = pathlib.Path(__file__).parent
+    ctx.load_cert_chain(cur / "cert.pem", cur / "key.pem")
+
+    ss = socket.socket()
+    ss.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
+    ss.bind(("localhost", 8088))
+    ss.listen(1)
+    s, addr = ss.accept()
+    s = ctx.wrap_socket(s, server_side=True)
+    print(s)
+    while True:
+        req = s.recv(65536)
+        print("<<<", req)
+        if req == b'Hello':
+            s.send(b'world\n')
+        elif req.startswith(b'Sleep'):
+            time.sleep(float(req.split()[1]))
+            s.send(b'Sleep done\n')
+        elif req == b'Bye':
+            s.send(b'So long!\n')
+            s.close()
+            break
+        else:
+            s.send(b'unknown command\n')
+
+
+async def main():
+    ctx = ssl.create_default_context(cafile="tests/cert.pem")
+    r, w = await asyncio.open_connection("localhost", 8088, ssl=ctx)
+    print(r, w)
+    w.write(b'Sleep 3')
+    print(await r.readline())
+    w.write(b'Hello')
+    print(await r.readline())
+
+
+t = threading.Thread(target=server)
+t.daemon = True
+t.start()
+
+asyncio.set_event_loop_policy(kloop.KLoopPolicy())
+asyncio.run(main())
diff --git a/tests/key.pem b/tests/key.pem
new file mode 100644
index 0000000..511b4d9
--- /dev/null
+++ b/tests/key.pem
@@ -0,0 +1,52 @@
+-----BEGIN PRIVATE KEY-----
+MIIJQwIBADANBgkqhkiG9w0BAQEFAASCCS0wggkpAgEAAoICAQCxO2dlXmFrI5NV
+/KroxuQtFomPi1WhqYxeapN6mqkTBAXFRjzQxSKJNyejF4pMfJOgRw8MEg3EMBDK
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+PcTNbfrOMsRvyHwyfUIHDaBT62YTztQ=
+-----END PRIVATE KEY-----